Hello Brynk, sorry for the delay! The 235/261 engine block is a full 3/4" shorter than the later 194/292 engine blocks. This was measured from the machined front surface of the blocks to the rear bellhousing mounting surface. The one exception is the 292 is taller than the other 194/250 engines, but the lengths are the same between the 194/292 engine family. From my experience, since your located in another country where many of the newer American engines aren't very popular or common, is its often easier to try and replace the old engine with one that is the most similar to it. Because trying to fabricate or make adapters to fit the newer engine is sometimes more costly in the end unless you have a surplus of junkyards to source things such as brackets, etc....
